Johan albrecht



J. ALBRECHT.

BOOT ORIMPER.

(No Model.)

No. 394,748. Patented Dec. 18, 1888. 4

@z;%/04% Ma /04 UNITED STATES PATENT OFFICE.

JO'HAN ALBRECHT, OF BUFFALO, NEW YORK.

. BOOT-CRIMPER.

SPECIFICATION forming part of Letters Patent No. 394,748, dated December18, 1888.

Application filed March 10, 1888- To all whom it may concern.-

Be it known that I, J OI-IAN ALBRECHT, a subject of the King of Prussia,residing at Buffalo, in the county of Erie and State of New York, haveinvented certain new and useful Improvements in Boot-Crimpers; and I dohereby declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled in the art to whichit appertains to make and use the same, reference being had to theaccompanying drawings, and to letters or figures of reference markedthereon, which form a part of this specification.

My invention consists in certain improvements in that class ofboot-crimpers which are secured to the last and have grippingjaws forengaging with and holding the edges of the upper while being erimped.

I will now proceed to describe the manner in which I have carried out myinvention.

In the drawings, Figure 1 is an elevation of my improved crimper. Fig. 2is a detached detail view, and Fig. 3 shows the last and upper with thecrimper attached.

Referring to the drawings, a is the frame or block of the crimper havingthe longitudinal slot a, which forms on either side the fixed jaws (L2(F, the outer surfaces of which are notched transversely, forming teetha a ar are screw-threaded bolts extending out from the side of the framea.

b b are the movable jaws, which are loosely pivoted to the sides of theframe at its top edges. Each jaw 11 is provided with an elongated slot,1), through which the screwthreaded bolts a" (t pass, the slots beingelongated, as shown, to allow sufficient outward play of the movablejaws during their manipulation. The lower inside surfaces of thesemovable jaws are notched transversely, forming teeth b similar to thoseon the fixed jaws a a which teeth are so placed as to register with theteeth of the fixed jaws a 0 c are thumb-nuts, movable upon the bolts ato press the movable jaws againstthe fixed jaws. The frame or block a isprovided with a central vertical screw-threaded orifice in which thescrew d is movable backand forth.

Serial No. 266,799. (No model.)

A handle, (1, upon the screw d serves to turn the same. The lower end ofthe screw d is passed through the slotted plate, and secured therein bythe pin (2. This slotted plate is secured' to the form upon which theleather is shaped by the screws 6 e The springs b serve to separate thejaws when the thumbnuts are loosened.

The operation of crimping with my improved device is as follows: Therelative position of the device upon the form is shown in Fig. 3. Theleather upper (shown at g) is bent over the form, and one side issecured between one set of jaws, as clearly shown in Fig. 1, the edge oftheleather being tightly gripped between the jaws a and b by means ofthe thumb-nut c. The other side is then pulled tightly toward theopposite set of jaws and placed therein, where it is also tightlyclamped. After this is accomplished, the turning of the screw dstretches the leather over the form to the required tension.

In crimping devices now in use the gripping of the edges of the upperand the stretching of the same are accomplished simultaneously, makingthe operation an awkward and difficult one. In my improved device eachset of jaws is operated independently of the other, and both sets ofjaws are in turn independent of the stretching-screw, thus making thecrimping of the leatherof the upper much easier and more reliable.

I claim- A boot-crimper consisting of the slotted frame or block (1,having the fixed jaws a 0 the pivoted movable spring-pressed jaws b 1),each operated independently of the other by separate screw-bolts andthumb-nuts a and c, and the stretching-screw d, secured to the form andoperating independently of the two sets of jaws to stretch the leather,substantially as shown and described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

J OHAN ALBRECHT. Witnesses:

W. T. MILLE OTTO HODDIOK.

